To the group:
What are your ideas on improving measurement uncertainty:
1. For a defined subject (such as a golden EUT) in proficiency testing
(most often a radiating noise source with integral antenna) Most
type A errors
2. For a real life EUT (configuration unknown) (additional type B
uncertainties , see GUM)
3. Is there a justification to use metrological methods in EMC ? Will
The current type "simple acceptance" of limit without guard band be
sufficient for the wireless future (see ILAC-G8) with increasing
need for legal certainty due to exponential increase of use of the
spectrum ?
Anyone has experiences to share in improving for example radiated site
attenuation uncertainties (the famous +/- 4 dB), the largest uncertainty
factor in radiated emissions testing uncertainty calculations by
frequency range division ?
Any ideas views /objections are welcome to discuss....
Gert Gremmen
On 8-10-2024 17:13, David Schaefer wrote:
Harry Hodes gave a presentation at the C63 meetings last week on
proficiency testing. He runs the ACIL PT program, and the data he
shared showed a ton of variance. Many labs were in I think +/-3-4 dB
range, but there were outliers – the worst cases being one lab reading
30-40 dB high, another 30-40 dB low. If I recall correctly for one PT
program 95 labs participated and around 10 were outside the expected
tolerance.
Doing a check of the measurement system prior to testing is critical.
A comb gen scan takes only a few minutes but should catch these
egregious errors.
David Schaefer
Technical Manager
Element Materials Technology
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*From:*doug emcesd.com <[email protected]>
*Sent:* Monday, October 7, 2024 6:08 PM
*To:* [email protected]
*Subject:* [PSES] technical musings
*CAUTION:*This email originated from outside of Element Materials
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I have seen differences of 9 dB on the same measurement on an EUT and
comb generator by different accredited labs!
Doug
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